IEC 62149-1:2011 provides references, definitions and rules for creating active fibre optic device performance standards, as well as related information pertinent to the subject. Subsequent parts of IEC 62149 are sequentially numbered and contain performance criteria for specific applications. Each part will be added as the performance criteria become standardised for international use. This second edition cancels and replaces the first edition published in 2004 and its corrigendum 1 (2004). It is a technical revision. The technical change consists of an update in Table A.1.